John Gill Commentary Luke 7:8

"For I also am a man set under authority, having under myself soldiers: and I say to this one, Go, and he goeth; and to another, Come, and he cometh; and to my servant, Do this, and he doeth it." — Luke 7:8 (ASV)

For I also am a man set under authority
Of the Roman senate; "or belonging to the emperor", as the Arabic version renders it; and under the command of a tribune, as a centurion was: so that this is not an amplification, but a diminution of his office; and his sense is, that even he who was but an inferior officer, yet had such power as after related:

having under me soldiers ;
an hundred, or more:

and I say unto one, go, and he goeth, and to another, come, and he
cometh, and to my servant, do this, and he doth it ;
as this his servant used to do, and whom he may intend, who now lay sick, and therefore was dear unto him. His meaning is, that Christ could as easily command, and call off a distemper, add it would obey him, as he could command obedience from his soldiers and servant, and have it, and more so.